Incandescent electric lamp



(No Model.)

L. HEINZ-E.

INGANDESGENT ELEGTRIG LAMP. No; 319,580. Patel lted June 9, 1885..

WITNESSES i INVENTOR ATTORNEY5,

UErTEE rarEs Louis HEINZE, 0E NEWARK, NEW JERSEY.

INCANDESCENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 319,580, dated June 9, 1885.

Application filed December 15, 1884. (No model.)

To aZZ whom it may concern:

Be it known that I, LOUIS HEINZE, of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Incandescent Electric Lamps, of which the following is a specification.

This invention has reference to an improved incandescent electric lamp in which the surface of the incandescent light-giving body is considerably increased, and thereby a more powerful light obtained; and the invention consists of an evacuated glass bulb, and of a light-giving part that is made of helical shape, and connected at the enlarged upper and lower terminals to the conductingwires. The light-giving carbon is connected at its end to the conducting-wires, which are supported in glass sockets or holders, one of which is made of greater length than the other and extended through the center of the bulb, whereby the convolutions of the helix are prevented from accidentally coming in contact with the central conducting-wire and short-circuiting the upper portion of the incandescent filament.

In the accompanying drawings, Figure 1 represents a sectional sideelevation of my improved incandescent electric lamp. Fig. 2 is a plan showing the method of making the helical carbons.

Similar letters of reference indicate corresponding parts.

A in the drawings represents a glass bulb, preferably made of the shape of a pear or an inverted heart; and B, the neck of the same, which neck is connected to a socket, C, having a switch, D, of any approved construction. The conducting-wires a care provided with eyes at their outer ends, that are hung to fixed hooks a a, attached to the socket G, the proper contact connection of the hooks and eyes being secured by a band-spring, 6, having bent ends, which are applied to the rim of the neck B. The pressure of the spring I) on the neck ]3 establishes and keeps up the contact between the books a and the eyes of the conducting-Wires a a. The conductingwires a a pass through glass sockets or holders d d to the interior of the bulb A, the

holder dbeing extended in the direction of the axis of the bulb A and made of greater length than the holder 01. The light-giving carbons E are made of helical shape, and provided at the upper and lower ends with perforated and enlarged terminals 0 e, to which the conducting-wires are attached by small clamping-disks e c, or in any other approved manner. The cross-section of the light-giving carbon may be made of oblong, triangular, or other shape. The helical carbon E is formed either by pressing a sheet of carbonizable material while in a plastic state in a mold of spiral shape, or it is out bya spiral cutter into spiral shape. After the spiral carbonizable material has been carbonized in a muffle it is extended into helical shape and attached to the ends of the conducting-wires within the bulb. The light-giving carbon is so supported in the bulb that the larger convolutions are at the wider part of the bulb, while the smaller convolutions are at the apex of the bulb, as shown in Fig. 1. After the helical carbon is placed in position in the bulb the latter is closed and evacuated to the proper degree of vacuum, and finally sealed in the usual manner. The helical form of the carbon increases the surface of the light-giving part, and thereby the body of light emitted therefrom, so that lamps of comparatively small shape but with high candle-power are obtained.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In an incandescent electric lamp, the combination of the hermetically-sealed bulb A, inclosing an incandescent filament, the neck B, and the conducting-wires a a, provided with eyes in their ends, with the socket G and the line-wires a a, having hooks in their ends for engaging said eyes, and the band-spring b, for detachably securing said neck within said socket, substantially as described.

2.. In an incandescent lamp, the combination of an evacuated glass bulb, a helical filament within said bulb, holders or sockets for said filament, one of said sockets extending into the helix, and conducting-wires connected to said sockets, substantially as described.

3. A filament for electric lamps, consisting my invention I have signed my name in pres of a cone-shaped helix, one end of said fila ence of two subscribingwitnesses. ment being at the base of the cone and the other end at the apex thereof, whereby said LOUIS 5 filament may be stamped out from asingle flat -Witnesses:

sheet, substantially as described. PAUL GOEPEL, In testimony that I claim the foregoing as CARL KARI. 

